{ rd 485 = 0；

SCON = 0x 50； //serial port working mode 1

TMOD =(TMOD & amp； 0x0F)| 0x 20； //Select timer 1 mode 2.

PCON = 0x 80； //Baud rate multiplication

th 1 = 0x F6； //The initial count value is 9600bps.

tr 1 = 1； //Start timer 1

IE | = 0x90// Enable serial interrupt

SBUF = 0x00

RI = 0；

}

Invalid delay (invalid)

{unsigned integer i;

for(I = 0； I & lt9500; i++)；

}

void sendbit(unsigned char *ch，int len)

{

int flaglen = 0；

rd 485 = 1；

delay()；

while(flaglen & lt； len) {

And (! TI) /* Check the sending mark */

{; }

TI = 0；

SBUF = *(ch+flaglen)； /* Send data */

flaglen++；

}

delay()；

rd 485 = 0；

} Use 3 to invalidate serial () interrupt 4.

{ if (RI)

{

if(fg & gt； =3)

fg = 0；

b[fg]= SBUF；

fg++；

RI = 0；

}

}

The single chip microcomputer crystal oscillator of this program is18.432m. When using it, the high and low eight bits of plastic data to be sent are put into a character array, which can be received by another single chip microcomputer through interruption. This program can be used to send and receive MCU.